CA2648461A1 - A method of controlling a mechanical compression ratio and a start timing of an actual compression action - Google Patents

A method of controlling a mechanical compression ratio and a start timing of an actual compression action Download PDF

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Publication number
CA2648461A1
CA2648461A1 CA002648461A CA2648461A CA2648461A1 CA 2648461 A1 CA2648461 A1 CA 2648461A1 CA 002648461 A CA002648461 A CA 002648461A CA 2648461 A CA2648461 A CA 2648461A CA 2648461 A1 CA2648461 A1 CA 2648461A1
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Canada
Prior art keywords
combustion chamber
set forth
pressure
temperature
gas
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Granted
Application number
CA002648461A
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French (fr)
Other versions
CA2648461C (en
Inventor
Daisuke Akihisa
Daisaku Sawada
Eiichi Kamiyama
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Toyota Motor Corp
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Individual
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Publication of CA2648461A1 publication Critical patent/CA2648461A1/en
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Publication of CA2648461C publication Critical patent/CA2648461C/en
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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D13/00—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing
    • F02D13/02—Controlling the engine output power by varying inlet or exhaust valve operating characteristics, e.g. timing during engine operation
    • F02D13/0223—Variable control of the intake valves only
    • F02D13/0234—Variable control of the intake valves only changing the valve timing only
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D15/00—Varying compression ratio
    • F02D15/04—Varying compression ratio by alteration of volume of compression space without changing piston stroke
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/023—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining the cylinder pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D35/00—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for
    • F02D35/02—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions
    • F02D35/025—Controlling engines, dependent on conditions exterior or interior to engines, not otherwise provided for on interior conditions by determining temperatures inside the cylinder, e.g. combustion temperatures
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
    • F02D—CONTROLLING COMBUSTION ENGINES
    • F02D41/00—Electrical control of supply of combustible mixture or its constituents
    • F02D41/0002—Controlling intake air
    • F02D2041/001—Controlling intake air for engines with variable valve actuation
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/10—Internal combustion engine [ICE] based vehicles
    • Y02T10/12—Improving ICE efficiencies

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Output Control And Ontrol Of Special Type Engine (AREA)
  • Combined Controls Of Internal Combustion Engines (AREA)
  • Electrical Control Of Air Or Fuel Supplied To Internal-Combustion Engine (AREA)

Abstract

An internal combustion engine provided with a variable compression ratio mechanism (A) able to change a mechanical compression ratio (A) and an actual compression action start timing changing mechanism (B) able to change a start timing of an actual compression action. An amount of intake air in accordance with the required load is fed into a combustion chamber (5) by controlling the closing timing of the intake valve (7), while a pressure in the combustion chamber (5) at the end of a compression stroke is maintained substantially constant regardless of the engine load by controlling the mechanical compression ratio.

Claims (30)

1. A method of controlling a mechanical compression ratio by a variable compression mechanism (A) and controlling a closing timing of an intake valve (7) by a variable valve timing mechanism (B) in a spark ignition type internal combustion engine, the closing timing of an intake valve (7) being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber (5), characterized in that the mechanical compression ratio is controlled so that the pressure in the combustion chamber (5) at the end of the compression stroke becomes substantially constant under substantially the same engine speed regardless of the engine load.
2. A method as set forth in claim 1, wherein the pressure in the combustion chamber (5) at the end of the compression stroke is the pressure in the combustion chamber (5) right before combustion or right before ignition by a spark plug (6).
3. A method as set forth in claim 1, wherein said pressure in the combustion chamber (5) made constant is made higher the higher the engine speed.
4. A method as set forth in claim 1, wherein the pressure in the combustion chamber (5) is directly detected and the mechanical compression ratio is controlled based on the detected pressure in the combustion chamber (5).
5. A method as set forth in claim 1, wherein the pressure in the engine intake passage (8, 11, 12) is detected, the pressure in the combustion chamber (5) at the end of the compression stroke is estimated from the detected pressure, and the mechanical compression ratio is controlled based on the estimated pressure in the combustion chamber.
6. A method as set forth in claim 1, wherein the mechanical compression ratio required for making the pressure in the combustion chamber (5) at the end of the compression stroke substantially constant regardless of the engine load is stored as a function of a representative value representing the pressure in the engine intake passage (8, 11, 12) and the amount of intake air fed into the combustion chamber (5), the pressure in the intake passage (8, 11, 12) and said representative value are detected, and the mechanical compression ratio is determined based on the detected pressure and representative value.
7. A method of controlling a mechanical compression ratio by a variable compression mechanism (A) and controlling a closing timing of an intake valve (7) by a variable valve timing mechanism (B) in a spark ignition type internal combustion engine, the closing timing of the intake valve (7) being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber (5), characterized in that the mechanical compression ratio is controlled so that the temperature of the gas in the combustion chamber (5) at the end of the compression stroke becomes substantially constant under substantially the same engine speed regardless of the engine load.
8. A method as set forth in claim 7, wherein the temperature of the gas in the combustion chamber (5) at the end of the compression stroke is the temperature in the combustion chamber (5) right before combustion or right before ignition by a spark plug (6).
9. A method as set forth in claim 7, wherein the temperature of the gas in the combustion chamber (5) made constant is made higher the higher the engine speed.
10. A method as set forth in claim 7, wherein the temperature of the gas in the combustion chamber (5) is directly detected and the mechanical compression ratio is controlled based on the detected temperature of the gas in the combustion chamber (5).
11. A method as set forth in claim 7, wherein the temperature of the intake air flowing into the combustion chamber (5) is detected, the temperature of the gas in the combustion chamber (5) at the end of the compression stroke is estimated from the estimated temperature, and the mechanical compression ratio is controlled based on the estimated temperature of the gas in the combustion chamber (5).
12. A method as set forth in claim 7, wherein the mechanical compression ratio required for making the temperature of the gas in the combustion chamber (5) at the end of the compression stroke substantially constant regardless of the engine load is stored as a function of the temperature of the intake air flowing into the combustion chamber (5) and a representative value representing the amount of intake air fed into the combustion chamber (5), the temperature of the intake air and said representative value are detected, and the mechanical compression ratio is determined based on these temperature and representative value.
13. A method of controlling a mechanical compression ratio by a variable compression mechanism (A) and controlling a closing timing of an intake valve (7) by a variable valve timing mechanism (B) in a spark ignition type internal combustion engine, the closing timing of the intake valve (7) being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber (5), characterized in that target values of the pressure in the combustion chamber (5) and gas temperature at the end of the compression stroke are stored in advance, and the mechanical compression ratio is controlled so that the pressure in the combustion chamber and gas temperature at the end of the compression stroke become the stored target values.
14. A method as set forth in claim 13, wherein the pressure in the combustion chamber (5) and gas temperature at the end of the compression stroke is the pressure in the combustion chamber (5) and gas temperature right before combustion or right before ignition by a spark plug (6).
15. A method as set forth in claim 13, wherein said target value is made higher the higher the engine speed.
16. A method as set forth in claim 13, wherein the pressure in the combustion chamber at the end of the compression stroke is found by directly detecting the pressure in the combustion chamber (5) or by estimation from the detected pressure in the intake passage (8, 11, 12).
17. A method as set forth in claim 13, wherein the temperature of the gas in the combustion chamber (5) at the end of the compression stroke is found by directly detecting the temperature of the gas in the combustion chamber (5) or by estimation from the detected temperature of intake air flowing into the combustion chamber (5).
18. A method of controlling a mechanical compression ratio by a variable compression mechanism (A) and controlling a closing timing of an intake valve (7) by a variable valve timing mechanism (B) in a spark ignition type internal combustion engine, the closing timing of the intake valve (7) being controlled so that an amount of intake air in accordance with the required load is fed into a combustion chamber (5), characterized in that the mechanical compression ratio is controlled so that the density of gas in the combustion chamber (5) at the end of the compression stroke becomes substantially constant under substantially the same engine speed regardless of the engine load.
19. A method as set forth in claim 18, wherein the density of gas in the combustion chamber (5) at the end of the compression stroke is the density of gas in the combustion chamber (5) right before combustion or right before ignition by a spark plug (6).
20. A method as set forth in claim 18, wherein the density of gas in the combustion chamber (5) made constant is made higher the higher the engine speed.
21. A method as set forth in claim 18, wherein the pressure in the combustion chamber (5) and gas temperature at the end of the compression stroke are found, the density of gas in the combustion chamber (5) at the end of the compression stroke is calculated from the pressure and gas temperature, and the mechanical compression ratio is controlled based on the calculated density of gas in the combustion chamber (5).
22. A method as set forth in claim 21, wherein the pressure in the combustion chamber (5) at the end of the compression stroke is found by directly detecting the pressure in the combustion chamber (5) or by estimation from the detected pressure in the intake passage (8, 11, 12).
23. A method as set forth in claim 21, wherein the temperature of the gas in the combustion chamber (5) at the end of the compression stroke is found by directly detecting the temperature of the gas in the combustion chamber (5) or by estimation from the detected temperature of the intake air flowing into the combustion chamber ( 5 ) .
24. A method as set forth in any one of claims 1, 7, 13, and 18, wherein at the time of engine low load operation, the mechanical compression ratio is made maximum to obtain an expansion ratio of 20 or more.
25. A method as set forth in any one of claims 1, 7, 13, or 18, wherein the closing timing of the intake valve (7) is shifted as the engine load becomes lower in a direction away from intake bottom dead center until a limit closing timing enabling control of the amount of intake air fed into the combustion chamber (5).
26. A method as set forth in claim 25, wherein in a region of a load higher than the engine load when the closing timing of the intake valve (7) reaches said limit closing timing, the amount of intake air fed into the combustion chamber (5) is controlled by the closing timing of the intake valve (7) without depending on a throttle valve (19) arranged in an engine intake passage (8, 11, 12, 14).
27. A method as set forth in claim 26, wherein in a region of a load higher than the engine load when the closing timing of the intake valve (7) reaches said limit closing timing, the throttle valve (19) is held in a fully opened state.
28. A method as set forth in claim 25, wherein in a region of a load lower than the engine load when the closing timing of the intake valve (7) reaches said limit closing timing, the amount of intake air fed into the combustion chamber (5) is controlled by a throttle valve (19) arranged in an engine intake passage (8, 11, 12, 14).
29. A method as set forth in claim 25, wherein in a region of a load lower than the.engine load when the closing timing of the intake valve (7) reaches said limit closing timing, the closing timing of the intake valve (7) is held at said limit closing timing.
30. A method as set forth in any one of claims 1, 7, 13, or 18, wherein when the mechanical compression ratio is increased to the limit mechanical compression ratio, the mechanical compression ratio is held at said limit mechanical compression ratio.
CA2648461A 2006-05-30 2007-04-09 A method of controlling a mechanical compression ratio and a start timing of an actual compression action Active CA2648461C (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
JP2006150262A JP4367439B2 (en) 2006-05-30 2006-05-30 Spark ignition internal combustion engine
JP2006-150262 2006-05-30
PCT/JP2007/058216 WO2007138794A1 (en) 2006-05-30 2007-04-09 Spark ignition type internal combustion engine

Publications (2)

Publication Number Publication Date
CA2648461A1 true CA2648461A1 (en) 2007-12-06
CA2648461C CA2648461C (en) 2012-04-03

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CA2648461A Active CA2648461C (en) 2006-05-30 2007-04-09 A method of controlling a mechanical compression ratio and a start timing of an actual compression action

Country Status (15)

Country Link
US (1) US7802543B2 (en)
EP (1) EP2024621B1 (en)
JP (1) JP4367439B2 (en)
KR (1) KR100993747B1 (en)
CN (1) CN101443539B (en)
AT (1) ATE456738T1 (en)
AU (1) AU2007268922B2 (en)
BR (1) BRPI0711856B1 (en)
CA (1) CA2648461C (en)
DE (1) DE602007004602D1 (en)
ES (1) ES2341187T3 (en)
MY (1) MY149245A (en)
PT (1) PT2024621E (en)
RU (1) RU2432480C2 (en)
WO (1) WO2007138794A1 (en)

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Also Published As

Publication number Publication date
US20090276140A1 (en) 2009-11-05
PT2024621E (en) 2010-03-05
CA2648461C (en) 2012-04-03
KR20080108467A (en) 2008-12-15
BRPI0711856A2 (en) 2011-12-13
RU2008152099A (en) 2010-07-10
RU2432480C2 (en) 2011-10-27
DE602007004602D1 (en) 2010-03-18
JP2007321589A (en) 2007-12-13
BRPI0711856B1 (en) 2019-02-12
ATE456738T1 (en) 2010-02-15
AU2007268922B2 (en) 2010-06-24
MY149245A (en) 2013-07-31
ES2341187T3 (en) 2010-06-16
JP4367439B2 (en) 2009-11-18
EP2024621A1 (en) 2009-02-18
US7802543B2 (en) 2010-09-28
EP2024621B1 (en) 2010-01-27
CN101443539A (en) 2009-05-27
KR100993747B1 (en) 2010-11-11
CN101443539B (en) 2010-12-15
WO2007138794A1 (en) 2007-12-06
AU2007268922A1 (en) 2007-12-06

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